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Hey guys, for some reason i am getting HORRIBLE gas mileage after putting on my new tires.. my tires can't be the cause of a dramatic change from 19 to 14-15.. I try to keep under 3000 rpm's so I know i am not too hard on it.. any advice??

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I hate to say it but it is probably the tires. Put your stockers back on and see what happens. Also, your speedo is off now since the new tires are bigger and thus your miles traveled is going to be more then what is recordered. Have you factored the new tire size (diameter) into your calculations?

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I run my stock tires at 40 psi and it not only improves fuel mileage a bit but also makes the thing handle much better. (not to mention coast much farther, which can really help fuel mileage when driving hills)

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i put 31's on but i guess i did not take in account the speedo being off.. i set the odometer right after i got gas and at the previous fill-up i put in 13.896 gallons and the odemeter read 194.5 miles... i may be miscalculating this....

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With a big increase of weight at each corner with those heavy tires, I am not surprised to see that much of a drop. That is a lot to add and it will definitely cause you to keep your foot in it more to keep the speed up, but I am surprised that that mileage decrease is that large. CAn you get your hands on a handheld gps to verify your speed and distance covered to figure out what the speedo and odometer are actually off by so you can re-calculate.

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When you filled up with gas, was it reading empty? Cuz you said you put in 13 gallons which is only half a tank. There's no way in heck that those tires are what's dropping you down to 14mpg, I'd have your truck checked out to see if anything is wrong.

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When you filled up with gas, was it reading empty? Cuz you said you put in 13 gallons which is only half a tank. There's no way in heck that those tires are what's dropping you down to 14mpg, I'd have your truck checked out to see if anything is wrong.

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I just looked it up on >>> Side-by-Side Comparison and apparently that's a pretty accurate reading at 17.5 mpg. I don't live in the city but the county is almost as bad nowadays. I will keep testing and maybe start driving like Fred Flinstone to save some coin.

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Its your new rims and tires. You went from 15" rims to 16" rims with bigger tires...and you have the 2.5L. You now have to use more gas to get the truck rolling.
If you want to improve mileage, your options are: install some mods, inflate your tires more, go back to stock rims/tires....or buy a civic.

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